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Basically i have a setup where timer disconnects negative line (relay) between battery and inverter. Inverter is 2500w pure sine wave and load that gets disconnected is ~1200w. After relay disconnects there is a high pitched whine coming from the inverter. Does inverter or some components in it...

I am building a small 120Ah 12v battery, from those very common blue Chinese aluminium cased cells. ? During initial charging/top balancing to 3.65v I noticed cells swelling. They are 3-4mm thicker from middle compared from edge. iam guessing this is normal. I placed about 2 mm thick wooden...

Hi, i am asking for your thoughts and ideas about a battery build that i am planning to do. I am planning to build 120ah 12v battery pack to power a inverter and 1000w car engine coolant heater/waterpump in the winter. (And trolling motor during summer) My motto is cheap is beautiful :) I...